$_The default or implicit variable.@_Subroutine parameters.$a
$bsort comparison routine variables.Regular Expressions$Regexp parenthetical capture holders.$&Last successful match (degrades performance).$`Prematch for last successful match string (degrades performance).$'Postmatch for last successful match string (degrades performance).$+Last paren match.$^NLast closed paren match.@+Offsets of ends of successful submatches in scope.@-Offsets of starts of successful submatches in sco
Link URL: http://blog.csdn.net/bji129/archive/2009/12/21/5049426.aspx
$bsort comparison routine variables.Regular Expressions$Regexp parenthetical capture holders.$&Last successful match (degrades performance).$`Prematch for last successful match string (degrades performance).$'Postmatch for last successful match string (degrades performance).$+Last paren match.$^NLast closed paren match.@+Offsets of ends of successful submatches in scope.@-Offsets of starts of successful submatches in sco
Link URL: http://blog.csdn.net/bji129/archive/2009/12/21/5049426.aspx
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/23025335/viewspace-624378/ ，如需转载，请注明出处，否则将追究法律责任。
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